CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

what is the meaning of "weak form "

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   March 16, 2006, 08:39
Default what is the meaning of "weak form "
Posts: n/a
what is the meaning of " weak form of the N-S equation", regards
  Reply With Quote

Old   March 16, 2006, 10:06
Default Re: what is the meaning of "weak form "
Posts: n/a
When the equations are written in differential form certain assumptions are implied concerning the smoothness of allowable solutions. In order to allow for discontinuous solutions, these assumptions have to be weakened by resorting to an integral form of the equations. With the integral form, a wider range of solutions can be supported, including discontinuous solutions.
  Reply With Quote

Old   March 20, 2006, 04:09
Default Re: what is the meaning of "weak form "
Posts: n/a
As it was mentioned by ag, we can not work with the called "strong form" of the problem due to the requirements, regularities, continuity, ... For that reason, the problem is normally reduced writting it in a "weak form". This is not limited to FEM or SEM types of methods and is the case in general. For example, if you are using FDM, or FVM you are using a "weak form", where to find the solution to the original problem consist in finding a set of values (at the discrete points) that are satisfing the discrete formulation of the problem.

  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
RANS in integral form siw Main CFD Forum 0 August 17, 2010 04:18
What's meaning of UDF FUNCTION zhaoxinyu Fluent UDF and Scheme Programming 0 March 31, 2010 09:04
Derivation of Momentum Equation in Integral Form Demonwolf Main CFD Forum 2 October 29, 2009 20:53
Fractional step in ALE form - possible? Wee Main CFD Forum 2 October 3, 2006 11:20
Get data in i,j,k forrmat ather than FE form Puneet FLUENT 0 November 19, 2003 13:40

All times are GMT -4. The time now is 19:47.